When NASA's Viking mission successfully landed a spacecraft on Mars, they recorded tons of data including high-resolution images of the planet's surface on microfilm.
Microfilm is a medium under the microforming umbrella. From Wikipedia:
Microforms are any forms, either films or paper, containing microreproductions of documents for transmission, storage, reading, and printing. Microform images are commonly reduced to about one twenty-fifth of the original document size. For special purposes, greater optical reductions may be used.
Of course we would have loved it if the NASA team had chosen some cinema quality film stock, but this is still a very interesting story about preservation and its importance at the highest levels.
And the little rolls of film are so cute!
David Williams is the planetary curation scientist for the NASA Space Science Data Coordinated Archive at Goddard Space Flight Center in Greenbelt, Maryland. The archive houses much of NASA's planetary and lunar spacecraft data stored on microfilm and computer tapes, including the Viking data. Williams works to digitize all of the data so that it can be easily accessed from the web. "At one time, microfilm was the archive thing of the future," Williams said. "But people quickly turned to digitizing data when the web came to be. So now we are going through the microfilm and scanning every frame into our computer database so that anyone can access it online."